Call of Duty: World at War (2008) is not officially available for free, though the base PC game can be purchased via authorized retailers, and it uniquely offers free DLC maps, including Zombie modes, upon installing required patches. The Treyarch-developed title features a four-player co-op campaign and a multiplayer mode running on the Modern Warfare engine, requiring 8GB of storage and modest specs. For the official, secure download and community support, visit Steam . Call of Duty: World at War on Steam